Method of and means for stripping cut and creased sheets



Dec. 4, 1951 H. J. LUEHRS 2,577,424

METHOD OF AND MEANS FOR STRIPPING I cu'r AND cREAsED SHEETS Filed Dec.31, 1946 V 5 Sheets-Sheet l Dec. 4, 1951 H. J. LUEHRS METHOD OF ANDMEANS FOR STRIPPING CUT AND CREASED SHEETS 5 Sheets-Sheet 2 Filed Dec.31

INVENTOR.

" in; ri 4 Dec. 4, 1951 H. J. LUEHRS METHOD OF AND MEANS FOR STRIPPINGCUT AND CREASED SHEETS 5 Sheets-Sheet 3 Filed Dec. 51, 1946 NEQINVENTOR.

Dec. 4, 1951 H. J. LUEHRS 2,577,424

' METHOD OF AND MEANS FOR STRIPPING CUT AND CREASED SHEETS 5Sheets-Sheet 4 Filed Dec. 51, 1946 &

Jig/7:22.

Ill

------- INVENTOR.

Dec. 4, 1951 H. J. LUEHRS METHOD OF AND MEANS FOR STRIPPING CUT ANDCREASED SHEETS Filed Dec. 51, 1946 5 Sheets-Sheet 5 INVENTOR.

Patented Dec. 4, 1951 METHOD-OF ANDMEANS FOR STRIPPING OUT AND GREASEDSHEETS Hans.J. Luehrs, Westerly, R..-I., assignor to.C..B. Cottrell &Sons. Company, Westerly, R. I., a corporation ofjD'elaware ApplicationDecember 31, 1946;.SerialiNo. 7.19553? 24.0laims.

. 1 The objectofmy inventionis-to provide a novel method oi. and meansfor stripping out and.

creased. sheets arranged in. apile by the coactionof upper; andlowerstripping diestosever the connections between. the useful andwasteportions; of the sheets.

invention further consists in providing oneof;the.- stripping dies witha raised waste portion contacting surface and the'other die with araised useful portion contacting-surface. the raised surface of one ofthe diesbeing higher than the raisedlsurfacee of. theother die forcausing a successive sheetstripping action.

inventionfurther consists inprovidingthe stripping dies with means. as,for, instance, 00-

acting projections. and. recesses. for releasably interlocking thecorresponding useful, portions of the pile to prevent theirunintentional displacementduringthesubsequent handling of the saiduseful portions.

My invention consists, more particularly, in. positioning; the lowerstripping; die to receive suc cessive cut and. creased sheets thereon atthe delivery end. of ,asheetcutter and creaser; moving the. lower die.with its pile of cut andcreased. sheets; to. the. sheet stripper intoregister with the upper stripping die; releasably locking the lowerdiewith its pileinregister with the upper die; moving the upperdiedownwards. to strip the Waste: portions from the useful portionsof thesheets and. at the same time to releasablyinterlockthe superimposeduseful portionsof the.

pile; raising theupper die to free it fromthe pile; unlocking the-lower.die. and finally. trans,- ferring. the-lower die .with its. pilev ofstripped sheets. to a. useful. and waste. portionremoval position.

My-invention also; includes the provisionoi a track.- and; a.truckmovable' along, the same for transierringithelower strippin diewith its-pile.

of: sheets: from the. sheetv cutter. and creaser. tor the-sheet.stripper in register with the upper stripping die and; afterthestrippingoperation ofthe twodies; to-transferthe stripped sheets mentsinthemethodof and means for stripping.

andjhandling the;= p iles.oi cut and creased sheets 2 which will be:hereafter more particularly setforth-and claimed.

In the accompanying drawings. I.haveshown. means whereby a pileofsheetswhichhave been.

' outv and. creased to produce. two folding. boxes from. eachsheet are.transferred. from thecutter andcreaserto. the-sheet stripperand-fromthenc'e. to. a position. where theboxes. and their waste;portions may be readily removed.

i Fig- 1 represents. adetailside view of the delivery end. of a. sheet.cutter. and creaser. of: any well known or approved construction and.showing: a partially completed pileofcutand creased". sheets; atransfer. truckv also. being. shown. in. positionto. receive the lower.dieand. the sheets when the. pileis completed.

Fig. 2. representsaa detail side-view of the sheet. stripper with thelower die and the pile-of. cut. and. creased sheets transferred. by thetruckint'o positionto bestripped...

Fig-.204 represents a..d'etail. vertical longitudinal. section through.the truck. to. moreclearli'y show the. manually. operated means. forlowering. and raising the truckbody.

Fig. 3 represents a detail" side view showing thepileoistrippedsheetsltogether withthe lower die. transf'erredby the truck. to. theiruseful and wasteport'ionmemovaI.position.

Fig. 4L represents atop plan view of. the parts showninFigl.

Fi'g. 5.represent's. a top plan view ofthe. parts shown in .Fig. 2;

Fig. G represents atop plan view of the parts shown in Fig. 3'.

Fig. '7 represents a. vertical. section taken in the planeofithellneVII'-VII'0f Fig. 2;

Fig- 8 represents a. plan. view of. the pile of cut and. creased sheets.before the sheets have been stripped. g

Fig. 9.. represents atop planview ofone of the stacks of. usefulportions after the. sheets have been stripped and. thewasteportionsremoved} Fig. 10.represents.a detail vertical sectiorr in whichthepileof. sheets has. been stripped be tween. the-upperdie which.contacts the useful portions only of the. toprsheet-of the. pileand thelower. die which contacts. the waste portions only. of. the bottomsheetofthe pile..

Fig 11 representsa bottom plan. view 01".. the upper stripping die: 7

Fig. 12 representseaztopplan view-oithelower strippin die.

Fig. 13 representsra'detailvertical section simia larstoFig, 10:except-that the upper. die'contacts:

I the: waste portions. only; oi. the top sheet. of: the:

3 pile and the lower die contacts the useful portions only of the bottomsheet of the pile.

Fig. 14 represents a bottom plan view of the upper die shown in Fig. 13.

Fig. 15 represents a top plan view of the lower die represented in thesaid Fig. 13.

In the form shown in Figs. 1 to 12 inclusive, the sheet cutter andcreaser l is shown as provided with the usual lifting chains 2 andremovable cross-bars 3 for supporting the delivery board 4 and the loweror female die 5 of the sheet stripper in position to receive successivecut and creased sheets from the sheet cutter and creaser, which sheetscomprise useful portions 6 as, for instance, folding boxes, and wasteportions 1 connected thereto as is usual, the connections 6 being formedby short uncut portions which alternate with the cut through portions 6between the said useful and waste portions 6 and I.

The sheet stripper is shown as comprising a base 8 having two pairs ofposts}; and I extending upwardly therefrom. These pairs of posts areadditionally supported by braces II and I2 uprising from the said base.

I The head l3 of the sheet stripper is vertically slidable on the pairsof posts 9 and I5. Two pairs of worm gears l4 and I are rotatablymounted in the head I3 and have screw-threaded engagements with theirrespective pairs of posts 9 and Ill. A horizontally disposed worm shafti6 is rotatably mounted in the head l3 and it has two worms l1 and I8meshing with their respective pairs of worm gears l4 and I5. This wormshaft I6 is shown as driven from a reversible electric motor 19 mountedon the head l3,

as by a rope 20 connecting the pulleys 2i and 22 on the motor shaft 23and worm, shaft I6 respectively.

A track leads from the sheet cutter and creaser I through the sheetstripper to a position where the useful and waste portions of thestripped sheets may be separated and removed. Grooves 25 and 26 alongthe top surface of the base 8 of the sheet stripper form seats for thetrack rails 21 and 28.

. A four-wheeled truck is movable along the track to the delivery end ofthe sheet cutter and creaser l in position to receive and support thedelivery board 4, the lower or female stripping die 5, and

the completed pile of cut and creased sheets. .w

This truck may be releasably locked tothe track in register with thesaiddelivery board, lower die and completed pile of cut and creased sheetsat this point, as by providing means for lowering the truck body29-.onto the track bed between the track rails 2'! and 28, to cause theholes 30 in the bottom of the truck body 29 to receive the registeringpins 3| located on the track bed between its rails 21 and 28.

The means for lowering and raising the truck body 29 is shown ascomprising a hand wheel 32 located beyond the rear end. of the truckbody, which hand wheel is carried by a horizontally disposed worm shaft33 mounted in the truck body, between its pairs of wheels 34 and 35 inposition to have its two worms 36 and 31 mesh with the wheels 38 and 39fast on the axles 40 and 4| respectively. Pairs of eccentric axle pins42 and 43 project from the ends of the axles 40 and 4! on whicheccentric pins the pairs of truck wheels 34 and 35 are rotatablymounted.

In operation: after the truck has received the delivery board'4, thelower die 5 and the completed pile of cut and creased sheets and thecrossbars 3 have been removed, the truck body 29 is raised from itslocked position on the track and the truck-is moved along the track tothe sheet stripper into register with the upper stripping die 44.

The truck may then be releasably locked to the track bed to register thelower die 5 with the upper die 44 by again lowering the truck body 29 bythe means already described, to cause the holes 30 to receive the secondset of registering pins 45 located on the track bed between the trackrails 21 and 28. In this position it will be seen that the weight istaken off the truck wheels 34 and 35.

The upper stripping die 44 may then be moved downwards into contact withthe top sheet of the pile and caused to exert suflicient pressurethereon to successively sever the connections 6 between the useful andwaste portions of the pile of cut and creased sheets.

I Thi upper die 44 is shown as provided with a raised surface 43arranged to contact the useful portions 6 of the top sheet of the pileand the lower die as provided with a raised surface 4'! in contact withthe waste portions 1 of the bottom sheet of the pile; the raised surface46 of the upper die being considerably higher than the raised surface 47of the lower die to ensure a shearing action to sever the connections 6between the useful and waste portions of successive sheets during thedownward stripping movement of the upper die.

It is to be understood that the stripping dies have contourscorresponding with the contours of the useful portions of the sheets toensure a correct stripping of the sheets.

Means may be provided for causing each stack of useful portions 6 of thesuperimposed cut and creased sheets to be releasably interlocked as thesheets are being stripped, to facilitate the handling of the usefulportions after the stripping operation. To accomplish this result theupper die 44 is provided with raised wedge-shaped pieces 48 and thelower die with relieved or recessed wedge-shaped pieces 49 which coactwith e the pieces 48 to bend corresponding element of each stack ofuseful portions to releasably interlock them.

' After the pile of sheets has been stripped and, in the presentinstance, the two stacks of useful portions of the sheets releasablyinterlocked, the upper die 44 is raised to free it from the pile byreversing the electric motor l9. The truck body 29 is then raised tofree the holes 30 from the second set of registering pins 45.

The truck with its delivery board 4, lower stripping die 5 and pile ofstripped sheets with their interlocked stacks of useful portions 6 maythen be moved along the track to the useful and waste portion removalposition. In this position the truck body 29 may again be lowered ontothe track to cause the holes 39 to receive the third set of pins 50which are located on the track at this point. The waste portions 1 whichhave been severed from the useful portions 6 may now be removed anddiscarded and the two stack of useful portions may also be removed forfurther operations thereon. In the meantime, a duplicate delivery boardand its lower stripping die 5 have been positioned by the chains 2 andtheir crossbars 3 to receive the successive cut and creased sheets ofthe next pile from the cutter and creaser. j

After the useful and waste portions have been removed from the truck,the truck may be again moved along the track to its first named posithe1410i- :the embodimentshown inll i'gs. 1 to 12 inclusive, becoming the:lower ydie f5] and the lower "die 5 becoming the upper die 52. .In'theembodiment :shown :in :Figs. 13, 14 :and 15 the .raisedcsurface' 53 aof:the lower diet]! is arranged to contact theuseful-portions 6 :of thebottom sheet of'the pile .ofcutrand creasedsheets-and the raised surface:54 of the upper die 52. is-arrangedto contact'the -waste portions :1 ofthe top sheet of the pile. :In this embodiment the lower die 51 isprovidedwithzthe raised wedge-shaped pieces .55 and the upper ".die withthe coacting relieved wedge-shaped pieces 55 "for releasablyinterlocking the superimposed useful :portionslfi of the sheets asthe'sheets :are being stripped.

"From the above description it' will be 'seen'ithat cutwand creasedsheets in pile form may .be zeasily and rapidly stripped by the coaction.ofisstrippin'g dies which contact the top and bottom ofthe'pileandiexer't sufiicient pressure to successively sever the connections.betweenuthe useful-and waste portions of the sheets. 7

While I have shown :andzdescribed the sheets as cut and creased to eachproduce "two useful portions, intheapresent"instancetwo folding boxblanks, it will be understood that I do not wish to limit myself tosheets cut :and creased to produce any particular number of Said usefulelements.

'What-I claim is:

"1. In a sheet stripper, upper and lower dies,

means for moving one or -the dies toward the other "dieto exertpressureon an interposed pile of "cut-and creased sheets to severtheconnec tions between the useful and waste portionsf-of the sheetstostrip them, said dies' havingcoactbetween the useful and waste portionsof the sheets to strip the1n, said stripping dies having coactingcutting and stripping elements of the same contoursas the said usefulportions, and means on said stripping dies coa'cting to releasablyinterlock the superimposed useful portions. -3. In a-sheet stripper,upper and 'lower dies and means'for-moving one of the dies toward theother die 'to exert pressure on an interposed pile of cut and creasedsheets to sever the'connections between the useful-'andwaste portions ofthe sheets to strip them, said-stripping dies having coacti-ng'cuttingand stripping elements of "the same contours'as the said-useful portionsand-also having=means coacting to bendcorresponding elements of' thesuperimposed useful portions to releasably interlock them;

' 4. In a sheet stripper, upper and lower dies and means for moving oneof the dies=toward the other die to'sever the connections between theuseful and *waste-portions of a pile :ofcut and 'creased'sheets'tostrip"them,'one die having a raised useful portioncontacting surface andthe other 'd-ie'having a raised-waste portion contacting surface, theraised surface of one of the dies being-of greater-height thanthe-raised sur 6 race -of:thezother-die :to ensmewthe-stripping action,..and1means on said-stripping dies :coacti-ng to :releasablyinterlock the superimposed useful portions.

5. In asheet stripper, upper and lower dies and means "for moving one ofthe "dies "toward the other .die to sever the connections between theuseful and waste-portions of a pile of cut and creased sheets tostripthem, :onedie having ,a raised useful portion contacting surface and theother die having a raised waste portion contacting-surface, the raisedsurface of one ofthe dies being of greater height than the raisedsurface of ithesother die to ensure the stripping action, said strippingdieshavingprojections and recesses coacting to bend correspondingelements of the superimposeduseful portions to releasably interlockthem.

6. In combination, a sheet stripper having up.- per and lower dies,.atracknbed-a track thereon passing through the sheet stripper, a "truckmovable on the track to bring the lower die with :a pile of cut andcreased sheets having connected useful and waste portions into registerwith the upper .die, said :dies having .coacting cutting: and strippingelements of the sameucontours as the said -usefuiportions, manuallyoperated means for lowering the truck body onto the'trackxbed, and means.for moving the upper :die toward :the lower the to sever theconnections between said useful and waste portions and to strip thesheets when the truck body is in :its lowered position. 1.Incombinatiomasheet stripper having upper and lower dies, a track bed, a track thereonpassing'through thesheet-strippena truck movable on the-track to bringthe lower die with-a pile oi out and creased sheets 'havingconnecteduseful and waste portions'into register-with the upper die, said -'dies"having: .coacting cutting and stripping-elements \of'the same contoursasthe said =use'fulportions, manually operated means for lowering thetruck-body -on-to the track bed, said truck body and track bed havingcoacting holes and pins to releasably lock the truck body in itsloweredposition, and means for moving the upper die toward'the lower dieto sever the connections between said useful and waste portions andstrip the sheets when the truck body is in its lowered position. *8. Incombination, a sheetstripper having upper-and lower dies, a track bed, atrack passing through-the sheet stripper, a truck, wheels thereonmovable on the track to bring the lower die witha pile of cutand creasedsheets-having con-- nected useful and waste I portions into registerwith-the upper die, said dieshaving coacting cutting and strippingelements of the same contours as the saidzusefulportions, eccentricmountings forthettruck wheels, and'manually operated meansi-toimpartarotary-movement to said eccentric :mount-ings ;for lmw'erine. thetruck body onto ,the track bed and-thereby releasing the weight from thetruck wheels, and Ineansfor moving the upper die. toward the lower dieto sever the connections between said useful and .Waste portionsandstrip the sheets when the truck body is in its. lowered. position. IThe method vLhich',-consists in assQQ atin a ,pile of cut andcreasedlsheetswith upper and lower dieshaving coacting cutting andstripping elements-"of'the samecontours as the usefukportions of thesheets, moving one of the dies toward the other die with sufiicientpressure on the pile to sever the connections between the useful andwaste'portions of the-sheets andzstrip the sheets, moving the lower dietogether with the stripped pile of sheets to a predetermined point andthereafter separating and removing the said useful and waste portions.

10. The method which consists'in associating a pile of cut and creasedsheets with upper and lower dies having coacting cutting and strippingelements of the same contours as the useful portions of the sheets, saiddies also having coacting useful portion interlocking elements, movingone of the dies toward the other die with sufficient pressure on thepile to ,sever the connections between the useful and waste portions ofthe sheets, strip the sheets and releasably interlock the superimposeduseful portions of the sheets, moving the lower die together with thestripped pile of sheets to a predetermined point and thereafterseparating and removing the said useful and waste portions.

11. The method which consists in associating a pile of cut and creasedsheets with upper and lower dies having coacting cutting and strippingelements of the same contours as the useful portions of the sheets, saiddiesalso having coacting-useful portion bending elements, moving one ofthe dies toward the other die with sufficient pressure on the pile tosever the connections between the useful and waste portions of thesheets, strip the sheets and bend corresponding parts of thesuperimposed useful portions to releasably interlock them, moving thelower die together With the stripped pile of sheets to a predeterminedpoint and thereafter separating andremoving the said useful and wasteportions.

12. The method which consists in moving a pile of cut and creased sheetstogether with a lower stripping die from a suitable source into registerwith an upper stripping die, said dies having coacting cutting andstripping elements of the same contours as the useful portions of thesheets, moving the upper die downward to exert sufficient pressure onthe pile to sever the connections between the useful and waste portionsof the sheets and strip the sheets and thereafter transferring the lowerdie with its pile of stripped sheets to a useful and waste portionseparation and removal position.

13. The method which consists in moving a pile of cut and creased sheetstogether-with a lower stripping die from a suitable source into registerwith an upper stripping die, said dies having coacting cutting andstripping elements of the same contours as the useful portions of thesheets, the dies also having useful portion interlocking elements,moving the said upper die downward to exert sufi'icient pressure on thepile to sever the connections between the useful and waste portions ofthe sheets, strip the sheets and releasably interlock the superimposeduseful portions, and thereafter transferring the lower die with its pileof stripped sheets to a useful and waste portion separation and removalposition.

14. The method which consists in moving a pile of cut and creased sheetsto ether with a lower stripping die from a suitable source into registerwith an upper stripping die, said dies having coacting cutting andstripping elements of the same contours as the useful portions of thesheets, releasably locking the lower die with its pile in such register,moving the upper die downward with sufficient pressure on the pile tosever the connections between the useful and waste portions of thesheets and strip the sheets and thereafter transferringthe lower diewith its 8v pile of stripped sheets to a useful and waste portionseparation and removal position.

15. The method which consists in moving a 'pileof cut and creased sheetstogether with a lower stripping die from a suitable source into registerwith an upper stripping die, said dies having coacting cutting andstripping elements of the same contours as the useful portions of thesheets, the dies also having useful portion interlocking elements,moving said upper die downward to exert sufficient pressure on the pileto sever the connections between the useful and waste portion of thesheets, strip the sheets and at the same time releasably interlock thesuperimposed useful portions, and thereafter transfer-1 ring'the lowerdie with its pile of stripped sheets to a useful and waste portionseparation and removal position. 1

16. In a sheet stripper, upper and lower dies, means for positioning thelower ,die to receive successive cut and creased sheets having connecteduseful and waste portions, means for receiving the lower die with itspile of sheets from the positioning'meansand moving the die with itspile into register with the upper die, said dies having coacting cuttingand stripping elements of the same contours as said useful portions, andmeans for moving the upper die downward to sever the waste portions fromthe useful portions of the superimposed sheets and strip them and thenupward to free the die from the pile. r

17. In a sheet stripper, upper and lower dies, means for positioning thelower die to receive successive out and creased sheets having connecteduseful and waste portions, means for receiving the lower die with itspile of sheets from the positioning means and moving the die with itspile into register with the upper die, said dies having coacting cuttingand stripping elements of the same contours as said useful portions,means for releasably locking the pile in its registered position, andmeans for moving the upper die downward onto the pile to sever the wasteportions from the useful portions of the superimposed sheets and stripthem and-then upward to free the die from the pile.

13. In a sheet stripper, upper and lower dies, means for positioning thelower die to receive successive cut and creased sheets having connectedusefuland waste portions, means for receiving the lower die with itspile of sheets from the positioning means and moving the die with itspile into register with the upper die, said dies having coacting cuttingand stripping elements of the-same contours as said useful portions, andmeans for moving the upper die downward to sever the waste portions fromthe useful portions of the superimposed sheets and strip them and thenupward to free the die from the pile, the lower die being subsequentlymovable 'with its pile of stripped sheets to a predetermined point.

19. In a sheet stripper, upper and lower dies, means for positioning thelower die to receive successive cut and creased sheets having connecteduseful and waste portions, means for receiving the lower die with itspile of sheets-from the positioning means and moving the die with itspile into register with the upper die, said dies having coacting cuttingand stripping elements of the same contours as said useful portions,means for releasably locking the pile in its registered position, andmeans for moving the upper die downward onto the pile to sever the wasteportions from theuseful portions of the 9 superimposed sheets and stripthem and then upward to free the die from the pile, the lower die beingsubsequently movable with its pile of stripped sheets to a predeterminedpoint.

20. In a sheet stripper, upper and lower dies, means for positioning thelower die for receiving from a sheet supply source successive cut andcreased sheets having connected useful and waste portions, means forreceiving the lower die and its pile from the positioning means andmoving the die with its pile into the sheet stripper in register withthe upper die, said dieshaving coacting cutting and stripping elementsof the same contours as said useful portions, and means for moving theupper die downward onto the pile to strip the'waste portions from theuseful portions and for thereafter raising the upper die, the lower diebeing subsequently movable with its pile of stripped sheets to apredetermined point.

21. In a sheet stripper, upper and lower dies, means for positioning thelower die to receive from a sheet supply source successive sheets havingconnected useful and waste portions, a track leading from the supplysource through the stripper to a predetermined point, a truck on saidtrack for receiving the lower die and its pile of sheets from thepositioning means and moving the die with its pile into register withthe upper die, said dies having coacting cutting and stripping elements,means for releasably locking the truck in its registered position, andmeans for moving the upper die downward onto the pile to sever theuseful and waste portions of the sheets and then upward to free the diefrom the pile, the truck being subsequently movable with its lower dieand pile to said predetermined point.

22.'In a sheet stripper, upper and lower dies, means for positioning thelower die to receive successive cut and creased sheets from a sheetsupply source, said sheets having connecting useful and waste portions,a track leading from the supply source through the stripper to apredetermined point, a truck on said track for receiving the lower dieand its pile of sheets from the positioning means and moving the diewith its pile into register with the upper die, said dies havingcoacting cutting and stripping elements of 'the same contours as thesaid useful portions,

means for lowering the truck body onto and raising it from the trackbed, means for releasably locking the truck in its lowered position, andmeans for moving the upper die downward onto the pile to sever theuseful and waste portions of the sheets and then upward to free the diefrom the pile, the truck being subsequently movable with its lower dieand pile to said predetermined point.

23. In a sheet stripper, upper and lower dies, means for positioning thelower die to receive cut and creased sheets from a sheet supply source,said sheets having connected useful and waste portions, a track leadingfrom the supply source through the sheet stripper to a predeterminedpoint, a truck movable on the track to receive the lower die with itspile of sheets from the positioning means and moving the die with itspile to the sheet stripper into register with the upper die, said dieshaving coacting cutting and stripping elements of the same contours asthe said useful portions, means for causing the dies to coact to severthe connections between the useful and waste portions of the sheets, thetruck being subsequently movable with its lower die and pile to saidpredetermined point, and means for releasably locking the truck at thesource of sheet supply and also at the sheet stripper.

24. In a sheet stripper, upper and lower dies, means for positioning thelower die to receive cut and creased sheets from a supply source, saidsheets having connected useful and waste portions, a track leading fromthe sheet supply source through the sheet stripper to a predeterminedpoint, a truck movable on the track for receiving the die with its pileof sheets from the positioning means and moving the die with its pile tothe sheet stripper into register with the upper die, said dies havingcoacting cutting and stripping elements of the same contours as theuseful portions, means for causing'the dies to coact to sever theconnections between the useful and waste portions of the sheets, saidtruck being movable with its lower die and pile to said predeterminedpoint, and means for releasably locking the truck at the source of sheetsupply, at the sheet stripper and at the said predetermined point.

HANS J. LUEHRS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 558,864 Van Osta Apr. 21, 18961,365,070 Zealand Jan. 11, 1921 1,981,974 Vernimb Nov. 27, 19341,983,708 Ruble et a1 Dec. 11, 1934

